Use of infant formulas in infants with cow milk allergy

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Abstract
Allergic (immune‐mediated) reactions to cow milk and other dietary proteins encountered during infancy are responsible for some of the adverse symptoms and syndromes observed in infants intolerant to cow milk, infant formulas and occasionally human milk. Iron deficiency anemia associated with gastrointestinal blood loss, protein losing enteropathy, enterocolitis, colitis, and malabsorption syndrome are examples of putative allergic reactions to dietary antigens which occur in infancy. A number of symptoms referable to the gastrointestinal tract such as, vomiting, colic and chronic non‐specific diarrhea occur in infants both with and without immune‐mediated reactions to dietary antigens. Verification of adverse reactions to dietary antigens, including allergic reactions, should be accomplished through the use of double‐blind, placebo‐controlled food challenge, with the dietary antigen to be tested presented in a liquid vehicle or, in older children, in capsule form. Approximately 8%–25% of children with immediate hypersensitivity to cow milk have been found to be allergic to soy products. Soy and other intact protein substitutes for cow milk, such as beef and lamb based formulas, have produced anaphylactic reactions both in human infants and in animal models. Hypoallergenic formulas should have a chemically modified protein base which demonstrates significant reduction in anti‐genicity when tested in the laboratory both in vitro and in vivo. Such formulas should meet rigorous standards for hypoallergenicity in clinical testing in human allergic infants or infants at high risk for developing allergy before being labelled hypoallergenic.

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